Hi Nordic team,
I’m currently using an nRF9160 DK and trying to test LTE-M connectivity with a custom test SIM and a network emulator. However, I’m facing multiple issues preventing me from using the board properly.
### Problem Description
- After connecting the nRF9160 DK via USB, **Windows Device Manager** shows:
- 3 COM ports:
- USB Serial Device (COM9)
- USB Serial Device (COM10)
- USB Serial Device (COM12)
- Under USB controllers:
- USB Composite Device
- USB Mass Storage Device
- There is **no device listed as J-Link or SEGGER**.
- I tried using **SecureCRT** or any other serial terminal to send **AT commands** to all three COM ports, but received **no response**.
- I installed the latest **J-Link Software and Documentation Pack** and used **J-Link Configurator (v8.56a)**, but it shows **no devices connected**.
- Running **J-Link Commander** gives this message:Cannot connect to J-Link via USB
- I tried dragging several `.hex` files (from SEGGER's demo packages) to the USB mass storage device:
- `emPower_HelloWorld.hex`
- `emPower_SEGGERDEMO.hex`
- `emPower_SpaceEvader.hex`
These files disappeared after copy, but the DK is still not detected as a J-Link device.
- I attempted to program modem firmware using **nRF Connect for Desktop → Programmer**, but it shows:No devices available
### Things I’ve checked
- USB cable supports data and is confirmed working on other boards.
- There is one LED ON on the DK, indicating power is present.
- Tried different USB ports and rebooted the computer.
- J-Link Configurator still shows **no devices found**.
- Tried to find UF2 recovery firmware, but the links are broken or not available.
### Questions
1. Is it possible that the board controller or J-Link firmware is corrupted?
2. How can I manually recover or re-flash the board controller (e.g., via UF2 or SWD)?
3. Is there any official recovery image or tool for restoring the nRF9160 DK’s debug interface?
4. Is this behavior expected if modem firmware is corrupted?
Any help would be greatly appreciated. Thank you!
Best regards,
Leo Lu
